- a positively charged elementary particle that is a fundamental constituent of all atomic nuclei. It is the lightest and most stable baryon, having a charge equal in magnitude to that of the electron, a spin of ½, and a mass of 1.673 × 10−27 kg. Symbol: P
Origin of proton
Examples from the Web for proton
Deuterium is an isotope of hydrogen containing a proton and neutron in its nucleus, while normal hydrogen has only a proton.Are Comets the Origin of Earth’s Oceans?
Matthew R. Francis
December 14, 2014
You have the atom, which has the neutron, the electron, the proton.‘Crazy’ Harlem Pastor Hates on Obama and Gays
September 28, 2014
But natural matter does have a tendency to let the electron fall into the proton.Invaders from the Infinite
John Wood Campbell
The same thing goes for a proton or electron or neutron or even a neutrino.By Proxy
Gordon Randall Garrett
Yet—the proton is positive and attracts the electron's negative charge.The Last Evolution
John Wood Campbell
One kind of speck is called “electron” and the other kind “proton.”
Then they would be just about as far apart but the smaller one would be the proton.
- a stable, positively charged elementary particle, found in atomic nuclei in numbers equal to the atomic number of the element. It is a baryon with a charge of 1.602176462 × 10 –19 coulomb, a rest mass of 1.672 62159 × 10 –27 kilogram, and spin 1/2
Word Origin and History for proton
1920 in physics, coined by English physicist Ernest Rutherford (1871-1937) from noun use of Greek proton, neuter of protos "first" (see proto-), on analogy of electron; supposedly because hydrogen was hypothesized as a constituent of all the elements. The word was used earlier in embryology (1893) as a translation of German anlage ("fundamental thing") based on Aristotle's phrase he prote ousia to proton.
- A stable, positively charged subatomic particle in the baryon family having a mass 1,836 times that of the electron.
- A stable subatomic particle in the baryon family having a mass of 1.672 X 10-24 grams (1,836 times that of the electron) and a positive electric charge of approximately 1.602 X 10-19 coulombs. Protons make up part of the nucleus of all atoms except hydrogen, whose nucleus consists of a single proton. In neutral atoms, the number of protons is the same as the number of electrons. In positively charged atoms, the number of protons is greater than the number of electrons, and in negatively charged atoms electrons outnumber protons. Protons are believed to be composed of two up quarks and one down quark. See Table at subatomic particle.